Add enable_runtimes option to Clang builder

...and set aarch64-full-2stage to "auto" meaning
that compiler-rt will go in RUNTIMES.

The option already exists in the functions below
this it just needed adding to the arguments.

This is the start of moving all the bots that use compiler-rt
and friends to using ENABLE_RUNTIMES rather than ENABLE_PROJECTS.

(https://discourse.llvm.org/t/should-buildbots-switch-to-enable-runtimes-instead-of-enable-projects-for-compiler-rt/65042)

Differential Revision: https://reviews.llvm.org/D133939

buildbot/osuosl/master/config/builders.py

@@ -455,6 +455,7 @@
                     clean=False,
                     checkout_flang=True,
                     checkout_lld=False,
+                    enable_runtimes="auto",
                     useTwoStage=True,
                     testStage1=False,
                     runTestSuite=True,

zorg/buildbot/builders/ClangBuilder.py

@@ -166,7 +166,9 @@ def getClangCMakeBuildFactory(
             checkout_lld=True,
             checkout_libcxx=False,
             checkout_flang=False,
-            checkout_test_suite=False):
+            checkout_test_suite=False,
+
+            enable_runtimes=None):
     return _getClangCMakeBuildFactory(
                clean=clean, checks=checks, cmake=cmake, jobs=jobs, vs=vs,
                vs_target_arch=vs_target_arch, useTwoStage=useTwoStage,
@@ -180,7 +182,8 @@ def getClangCMakeBuildFactory(
                checkout_compiler_rt=checkout_compiler_rt,
                checkout_libcxx=checkout_libcxx,
                checkout_flang=checkout_flang,
-               checkout_test_suite=checkout_test_suite)
+               checkout_test_suite=checkout_test_suite,
+               enable_runtimes=enable_runtimes)
 
 def _getClangCMakeBuildFactory(
             clean=True,
@@ -218,6 +221,8 @@ def _getClangCMakeBuildFactory(
             checkout_test_suite=False,
             checkout_flang=False,
 
+            enable_runtimes=None,
+
             # Upload artifacts to Google Cloud Storage (for the llvmbisect tool)
             stage1_upload_directory=None,
 
@@ -267,7 +272,8 @@ def _getClangCMakeBuildFactory(
 
     f = LLVMBuildFactory(
             depends_on_projects=depends_on_projects,
-            llvm_srcdir='llvm')
+            llvm_srcdir='llvm',
+            enable_runtimes=enable_runtimes)
 
     # Checkout the latest code for LNT
     # and the test-suite separately. Le's do this first,