[arm64] Optimize fcmp when lhs operand is #0.0

src/compiler/x87/code-generator-x87.cc

Index: src/compiler/x87/code-generator-x87.cc
diff --git a/src/compiler/x87/code-generator-x87.cc b/src/compiler/x87/code-generator-x87.cc
index 596b7ab775343b251f55e1014dfce84ddcbe78e0..4f90a80d8ae1a69ab6a18d9b82c9c97489396f52 100644
--- a/src/compiler/x87/code-generator-x87.cc
+++ b/src/compiler/x87/code-generator-x87.cc
@@ -1282,6 +1282,9 @@ void CodeGenerator::AssembleArchBranch(Instruction* instr, BranchInfo* branch) {
     case kNotOverflow:
       __ j(no_overflow, tlabel);
       break;
+    default:
+      UNREACHABLE();
+      break;
   }
   // Add a jump if not falling through to the next block.
   if (!branch->fallthru) __ jmp(flabel);
@@ -1352,6 +1355,9 @@ void CodeGenerator::AssembleArchBoolean(Instruction* instr,
     case kNotOverflow:
       cc = no_overflow;
       break;
+    default:
+      UNREACHABLE();
+      break;
   }
   __ bind(&check);
   if (reg.is_byte_register()) {