Fix some missing opcodes in bcanalyzer

[tejohnson]

LGTM

[arsenm]

r342878

test/Bitcode/bcanalyzer-atomics.ll

+; RUN: llvm-as < %s | llvm-bcanalyzer -dump | FileCheck %s
+; Make sure the names of atomics are known
+
+; CHECK: INST_CMPXCHG
+; CHECK: INST_STOREATOMIC
+; CHECK: INST_LOADATOMIC
+; CHECK: INST_FENCE
+define void @atomics(i32* %ptr) {
+  store atomic i32 0, i32* %ptr monotonic, align 4
+  %load = load atomic i32, i32* %ptr monotonic, align 4
+  %xchg = cmpxchg i32* %ptr, i32 0, i32 5 acquire monotonic
+  fence seq_cst
+  ret void
+}

tools/llvm-bcanalyzer/llvm-bcanalyzer.cpp

default: return nullptr;
       STRINGIFY_CODE(FUNC_CODE, INST_INSERTVAL)
       STRINGIFY_CODE(FUNC_CODE, INST_CMP2)
       STRINGIFY_CODE(FUNC_CODE, INST_VSELECT)
       STRINGIFY_CODE(FUNC_CODE, DEBUG_LOC_AGAIN)
       STRINGIFY_CODE(FUNC_CODE, INST_CALL)
       STRINGIFY_CODE(FUNC_CODE, DEBUG_LOC)
       STRINGIFY_CODE(FUNC_CODE, INST_GEP)
       STRINGIFY_CODE(FUNC_CODE, OPERAND_BUNDLE)
+      STRINGIFY_CODE(FUNC_CODE, INST_FENCE)
+      STRINGIFY_CODE(FUNC_CODE, INST_ATOMICRMW)
+      STRINGIFY_CODE(FUNC_CODE, INST_LOADATOMIC)
+      STRINGIFY_CODE(FUNC_CODE, INST_STOREATOMIC)
+      STRINGIFY_CODE(FUNC_CODE, INST_CMPXCHG)
     }
   case bitc::VALUE_SYMTAB_BLOCK_ID:
     switch (CodeID) {
     default: return nullptr;
     STRINGIFY_CODE(VST_CODE, ENTRY)
     STRINGIFY_CODE(VST_CODE, BBENTRY)
     STRINGIFY_CODE(VST_CODE, FNENTRY)
     STRINGIFY_CODE(VST_CODE, COMBINED_ENTRY)