Create --incompatible_remap_main_repo flag.

This flag fixes a bug in bazel where within a repository called "foo", the labels @foo//some/path:bar.bzl and //some/path:bar.bzl were treated as different labels. It is unlikely that this flag will affect any projects but it is technically a breaking change and so it is guarded behind a flag.

Towards #7130

RELNOTES: None
PiperOrigin-RevId: 229813128

src/test/java/com/google/devtools/build/lib/packages/SkylarkSemanticsConsistencyTest.java

diff --git a/src/test/java/com/google/devtools/build/lib/packages/SkylarkSemanticsConsistencyTest.java b/src/test/java/com/google/devtools/build/lib/packages/SkylarkSemanticsConsistencyTest.java
index 0ea7ef7..b31a3d5 100644
--- a/src/test/java/com/google/devtools/build/lib/packages/SkylarkSemanticsConsistencyTest.java
+++ b/src/test/java/com/google/devtools/build/lib/packages/SkylarkSemanticsConsistencyTest.java
@@ -130,7 +130,6 @@
             + ","
             + rand.nextDouble(),
         "--experimental_platforms_api=" + rand.nextBoolean(),
-        "--experimental_remap_main_repo=" + rand.nextBoolean(),
         "--experimental_starlark_config_transitions=" + rand.nextBoolean(),
         "--experimental_transition_whitelist_location=" + rand.nextDouble(),
         "--incompatible_bzl_disallow_load_after_statement=" + rand.nextBoolean(),
@@ -153,6 +152,7 @@
         "--incompatible_no_support_tools_in_action_inputs=" + rand.nextBoolean(),
         "--incompatible_no_target_output_group=" + rand.nextBoolean(),
         "--incompatible_no_transitive_loads=" + rand.nextBoolean(),
+        "--incompatible_remap_main_repo=" + rand.nextBoolean(),
         "--incompatible_remove_native_maven_jar=" + rand.nextBoolean(),
         "--incompatible_require_feature_configuration_for_pic=" + rand.nextBoolean(),
         "--incompatible_strict_argument_ordering=" + rand.nextBoolean(),
@@ -175,7 +175,6 @@
         .experimentalJavaCommonCreateProviderEnabledPackages(
             ImmutableList.of(String.valueOf(rand.nextDouble()), String.valueOf(rand.nextDouble())))
         .experimentalPlatformsApi(rand.nextBoolean())
-        .experimentalRemapMainRepo(rand.nextBoolean())
         .experimentalStarlarkConfigTransitions(rand.nextBoolean())
         .experimentalTransitionWhitelistLocation(String.valueOf(rand.nextDouble()))
         .incompatibleBzlDisallowLoadAfterStatement(rand.nextBoolean())
@@ -198,6 +197,7 @@
         .incompatibleNoSupportToolsInActionInputs(rand.nextBoolean())
         .incompatibleNoTargetOutputGroup(rand.nextBoolean())
         .incompatibleNoTransitiveLoads(rand.nextBoolean())
+        .incompatibleRemapMainRepo(rand.nextBoolean())
         .incompatibleRemoveNativeMavenJar(rand.nextBoolean())
         .incompatibleRequireFeatureConfigurationForPic(rand.nextBoolean())
         .incompatibleStricArgumentOrdering(rand.nextBoolean())

src/test/java/com/google/devtools/build/lib/packages/WorkspaceFactoryTest.java

diff --git a/src/test/java/com/google/devtools/build/lib/packages/WorkspaceFactoryTest.java b/src/test/java/com/google/devtools/build/lib/packages/WorkspaceFactoryTest.java
index 95fdca0..bcd395f 100644
--- a/src/test/java/com/google/devtools/build/lib/packages/WorkspaceFactoryTest.java
+++ b/src/test/java/com/google/devtools/build/lib/packages/WorkspaceFactoryTest.java
@@ -204,7 +204,7 @@
 
   @Test
   public void testImplicitMainRepoRename() throws Exception {
-    helper.setSkylarkSemantics("--experimental_remap_main_repo");
+    helper.setSkylarkSemantics("--incompatible_remap_main_repo");
     helper.parse("workspace(name = 'foo')");
     assertMapping(helper, "@", "@foo", "@");
   }

src/test/java/com/google/devtools/build/lib/skyframe/RepositoryMappingFunctionTest.java

diff --git a/src/test/java/com/google/devtools/build/lib/skyframe/RepositoryMappingFunctionTest.java b/src/test/java/com/google/devtools/build/lib/skyframe/RepositoryMappingFunctionTest.java
index f7d10db..7da92b6 100644
--- a/src/test/java/com/google/devtools/build/lib/skyframe/RepositoryMappingFunctionTest.java
+++ b/src/test/java/com/google/devtools/build/lib/skyframe/RepositoryMappingFunctionTest.java
@@ -146,7 +146,7 @@
 
   @Test
   public void testDefaultMainRepoNameInMapping() throws Exception {
-    setSkylarkSemanticsOptions("--experimental_remap_main_repo");
+    setSkylarkSemanticsOptions("--incompatible_remap_main_repo");
     scratch.overwriteFile(
         "WORKSPACE",
         "local_repository(",
@@ -168,7 +168,7 @@
 
   @Test
   public void testExplicitMainRepoNameInMapping() throws Exception {
-    setSkylarkSemanticsOptions("--experimental_remap_main_repo");
+    setSkylarkSemanticsOptions("--incompatible_remap_main_repo");
     scratch.overwriteFile(
         "WORKSPACE",
         "workspace(name = 'good')",