[ScalableVectors] Warn instead of error for invalid size requests.

This was intended to be fixed by D98856, but that only seemed to have
the desired behaviour when compiling to assembly using `-S`, not when
compiling into an object file or executable. Given that this was not
the intention of D98856, this patch fixes the behaviour.

clang/lib/Driver/ToolChains/Clang.cpp

@@ -5318,7 +5318,8 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
   // as errors, but until then, we can live with a warning being emitted by the
   // compiler. This way, Clang can be used to compile code with scalable vectors
   // and identify possible issues.
-  if (isa<BackendJobAction>(JA)) {
+  if (isa<AssembleJobAction>(JA) || isa<CompileJobAction>(JA) ||
+      isa<BackendJobAction>(JA)) {
     CmdArgs.push_back("-mllvm");
     CmdArgs.push_back("-treat-scalable-fixed-error-as-warning");
   }

clang/test/Driver/fsanitize-coverage.c

@@ -106,7 +106,7 @@
 
 // RUN: %clang -target x86_64-linux-gnu -fsanitize-coverage=inline-8bit-counters %s -### 2>&1 | FileCheck %s --check-prefix=CHECK_INLINE8BIT
 // RUN: %clang -target x86_64-linux-gnu -fsanitize-coverage=bb,inline-8bit-counters %s -### 2>&1 | FileCheck %s --check-prefix=CHECK_INLINE8BIT
-// CHECK_INLINE8BIT-NOT: warning
+// CHECK_INLINE8BIT-NOT: warning:
 // CHECK_INLINE8BIT: -fsanitize-coverage-inline-8bit-counters
 
 // RUN: %clang -target x86_64-linux-gnu -fsanitize-coverage=inline-8bit-counters,pc-table %s -### 2>&1 | FileCheck %s --check-prefix=CHECK_PC_TABLE_FOR_INLINE8BIT
@@ -115,7 +115,7 @@
 
 // RUN: %clang -target x86_64-linux-gnu -fsanitize-coverage=inline-bool-flag %s -### 2>&1 | FileCheck %s --check-prefix=CHECK_INLINE_BOOL_FLAG
 // RUN: %clang -target x86_64-linux-gnu -fsanitize-coverage=bb,inline-bool-flag %s -### 2>&1 | FileCheck %s --check-prefix=CHECK_INLINE_BOOL_FLAG
-// CHECK_INLINE_BOOL_FLAG-NOT: warning
+// CHECK_INLINE_BOOL_FLAG-NOT: warning:
 // CHECK_INLINE_BOOL_FLAG: -fsanitize-coverage-inline-bool-flag
 
 // RUN: %clang -target x86_64-linux-gnu -fsanitize-coverage=inline-bool-flag,pc-table %s -### 2>&1 | FileCheck %s --check-prefix=CHECK_PC_TABLE_FOR_INLINEBOOL