tree cb6ca52ddada1f718089d4ff2e21d5d3eb79eee3
parent e85b5a7a7c4968ff3451573b4b8ca2a52a3e9961
author hlopko <hlopko@google.com> 1505828578 +0200
committer László Csomor <laszlocsomor@google.com> 1505834276 +0200

Do not duplicate build variables, reuse variables from cc toolchain

Before this cl each linking and compilation action would contain a full copy of
all build variables. However, some build variables can be reused, for the
memory consumption benefit. With this cl, we contruct a Variables instance in
the CcToolchain, and make it a parent of all per-linking and per-compilation
variables.

RELNOTES: None.
PiperOrigin-RevId: 169233756