[clang] [CIR] Upstream builtin lowering emitter & FAbs op (PR #151750)

[Bruno Cardoso Lopes via cfe-commits]

================
@@ -410,3 +410,7 @@ def calculate_arch_features(arch_string):
 # possibly be present in system and user configuration files, so disable
 # default configs for the test runs.
 config.environment["CLANG_NO_DEFAULT_CONFIG"] = "1"
+
+# Check if clangir is enabled.
+if config.clang_enable_cir:
+    config.available_features.add("clangir")
----------------
bcardosolopes wrote:

Indentation seems to be off compared to the rest of the script

https://github.com/llvm/llvm-project/pull/151750