[ASan] Fix use-after-scope in COMMON_INTERCEPTOR_ENTER implementation.
[ASan] Fix use-after-scope in COMMON_INTERCEPTOR_ENTER implementation.

Make sure "void *ctx" doesn't point to an object which already went out
of scope. This might also fix -Wuninitialized warnings GCC 4.7 produces
while building ASan runtime.

git-svn-id: c199f293c43da69278bea8e88f92242bf3aa95f7@227258 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt