Revert "Enhance BranchProbabilityInfo::calcUnreachableHeuristics for InvokeInst"

This reverts commit r256028.

It broke:

    LLVM :: CodeGen/Mips/eh.ll
    LLVM :: CodeGen/Mips/insn-zero-size-bb.ll

llvm-svn: 256032
diff --git a/llvm/test/CodeGen/X86/catchret-empty-fallthrough.ll b/llvm/test/CodeGen/X86/catchret-empty-fallthrough.ll
index 7ad1033..5405d57 100644
--- a/llvm/test/CodeGen/X86/catchret-empty-fallthrough.ll
+++ b/llvm/test/CodeGen/X86/catchret-empty-fallthrough.ll
@@ -34,14 +34,12 @@
 
 ; CHECK-LABEL: foo: # @foo
 ; CHECK: testb $1, %cl
-; CHECK: je .LBB0_[[try:[0-9]+]]
-; CHECK: .LBB0_[[return:[0-9]+]]:
-; CHECK: retq
-; CHECK: .LBB0_[[try]]:
+; CHECK: jne .LBB0_[[return:[0-9]+]]
 ; CHECK: .Ltmp0:
 ; CHECK: callq bar
 ; CHECK: .Ltmp1:
 ; CHECK: .LBB0_[[catch:[0-9]+]]:
+; CHECK: .LBB0_[[return]]:
 
 ; CHECK: .seh_handlerdata
 ; CHECK-NEXT: .Lfoo$parent_frame_offset = 32