[BOLT][AArch64] Refuse to run FrameOptimizer pass

FrameOptimizer pass runs by default on all targets, however, it defaults
to --frame-opt=none. This patch prevents the pass from running on
non-x86 targets when any other value (hot, full) is specified.

Author: paschalis-mpeis

bolt/lib/Passes/FrameOptimizer.cpp

@@ -224,6 +224,11 @@ Error FrameOptimizerPass::runOnFunctions(BinaryContext &BC) {
   if (opts::FrameOptimization == FOP_NONE)
     return Error::success();
 
+  if (!BC.isX86()) {
+    BC.errs() << "BOLT-ERROR: " << getName() << " is supported only on X86.\n";
+    exit(1);
+  }
+
   std::unique_ptr<BinaryFunctionCallGraph> CG;
   std::unique_ptr<FrameAnalysis> FA;
   std::unique_ptr<RegAnalysis> RA;

bolt/test/AArch64/unsupported-passes.test

@@ -0,0 +1,8 @@
+// Checks that non-fully supported passes on AArch64 are handled appropriately.
+
+// REQUIRES: system-linux,asserts,target=aarch64{{.*}}
+
+RUN: %clang %cflags %p/../Inputs/hello.c -o %t -Wl,-q
+RUN: not llvm-bolt %t -o %t.bolt --frame-opt=all 2>&1 | FileCheck %s
+
+CHECK: BOLT-ERROR: frame-optimizer is supported only on X86.