[clang-ppc64-aix] Set OBJECT_MODE an a builder wide env

[daltenty]

Summary

Currently we pass this env to the build factory, but that means it only gets propogated to those factory steps which remember to pass the env into their respective shell commands.

On AIX, it's important that this env remain constant accross the cmake/ninja/lit invocations or we will get into strange mixed bitmode situations, so set it as a build env that will be inherited by all shell commands by default.

[ZarkoCA]

I don't know whether it's an issue that the patch is missing context but the change is good, Thanks @daltenty

[daltenty]

Fix missing context on diff

[daltenty]

Slightly tweak whitespace formatting

buildbot/osuosl/master/config/builders.py

'factory' : TestSuiteBuilder.getTestSuiteBuildFactory(
                         "-DCMAKE_BUILD_TYPE=Release",
                         "-DLLVM_LIT_ARGS=-vj 20"])},
 
     {'name' : "clang-ppc64-aix",
     'tags'  : ["clang", "aix", "ppc"],
     'workernames' : ["aix-ppc64"],
     'builddir': "clang-ppc64-aix",
     'factory' : TestSuiteBuilder.getTestSuiteBuildFactory(
-                    env={'OBJECT_MODE': '64'},
                     depends_on_projects=["llvm", "clang", "compiler-rt"],
                     enable_runtimes="auto",
                     clean=False,
                     extra_configure_args=[
                         "-DLLVM_ENABLE_ASSERTIONS=On",
                         "-DCMAKE_C_COMPILER=/opt/IBM/openxlC/17.1.0/bin/ibm-clang",
                         "-DCMAKE_CXX_COMPILER=/opt/IBM/openxlC/17.1.0/bin/ibm-clang++_r",
                         "-DPython3_EXECUTABLE:FILEPATH=/opt/freeware/bin/python3_64",
                         "-DLLVM_ENABLE_ZLIB=OFF", "-DLLVM_APPEND_VC_REV=OFF",
                         "-DLLVM_PARALLEL_LINK_JOBS=2",
-                        "-DLLVM_ENABLE_WERROR=ON"])},
+                        "-DLLVM_ENABLE_WERROR=ON"]),
+    'env' : {'OBJECT_MODE': '64'}},
 
     {'name' : "clang-s390x-linux",
     'tags'  : ["clang"],
     'workernames' : ["systemz-1"],
     'builddir': "clang-s390x-linux",
     'factory' : ClangBuilder.getClangCMakeBuildFactory(
                     jobs=4,
                     clean=False,