[WebAssembly] Cleanup Emscripten SjLj tests

[aheejin]

Summary

• Remove a redundant test: there were longjmp_only and only_longjmp, which do the same thing
• Add CHECK-LABEL lines for function names

llvm/test/CodeGen/WebAssembly/lower-em-sjlj.ll

if.end:                                           ; preds = %if.then, %entry
   unreachable
 ; CHECK: if.end:
 ; CHECK: %[[VAR2]] = phi i32 [ %[[VAR1]], %if.then.split ], [ undef, %entry ]
 ; CHECK: %[[SETJMP_TABLE_SIZE3]] = phi i32 [ %[[SETJMP_TABLE_SIZE2]], %if.then.split ], [ %[[SETJMP_TABLE_SIZE0]], %entry ]
 ; CHECK: %[[SETJMP_TABLE3]] = phi i32* [ %[[SETJMP_TABLE2]], %if.then.split ], [ %[[SETJMP_TABLE0]], %entry ]
 }
 
 ; Test a case when a function only calls other functions that are neither setjmp nor longjmp
-define void @only_other_func() {
+define void @other_func_only() {
+; CHECK-LABEL: @other_func_only
 entry:
   call void @foo()
   ret void
 ; CHECK: call void @foo()
 }
 
-; Test a case when a function only calls longjmp and not setjmp
-define void @only_longjmp() {
-entry:
-  %buf = alloca [1 x %struct.__jmp_buf_tag], align 16
-  %arraydecay = getelementptr inbounds [1 x %struct.__jmp_buf_tag], [1 x %struct.__jmp_buf_tag]* %buf, i32 0, i32 0
-  call void @longjmp(%struct.__jmp_buf_tag* %arraydecay, i32 5) #1
-  unreachable
-; CHECK: %[[JMPBUF:.*]] = ptrtoint
-; CHECK-NEXT: call void @emscripten_longjmp([[PTR]] %[[JMPBUF]], i32 5)
-}
-
 ; Test inline asm handling
 define void @inline_asm() {
 ; CHECK-LABEL: @inline_asm
 entry:
   %env = alloca [1 x %struct.__jmp_buf_tag], align 16
   %arraydecay = getelementptr inbounds [1 x %struct.__jmp_buf_tag], [1 x %struct.__jmp_buf_tag]* %env, i32 0, i32 0
   %call = call i32 @setjmp(%struct.__jmp_buf_tag* %arraydecay) #4
 ; Inline assembly should not generate __invoke wrappers.
entry:
   %buf = alloca [1 x %struct.__jmp_buf_tag], align 16
   %arraydecay = getelementptr inbounds [1 x %struct.__jmp_buf_tag], [1 x %struct.__jmp_buf_tag]* %buf, i32 0, i32 0
   %call = call i32 @setjmp(%struct.__jmp_buf_tag* %arraydecay) #0
 ; CHECK: call cc{{.*}} i8* @"__invoke_i8*_i32_%struct.__jmp_buf_tag*"([[ARGS:.*]]) #[[ALLOCSIZE_ATTR:[0-9]+]]
   %alloc = call i8* @allocator(i32 20, %struct.__jmp_buf_tag* %arraydecay) #3
   ret i8 *%alloc
 }
 
-; Tests if program does not crash when there's no setjmp function calls in the
-; module.
+; Test a case when a function only calls longjmp and not setjmp
 @buffer = global [1 x %struct.__jmp_buf_tag] zeroinitializer, align 16
 define void @longjmp_only() {
+; CHECK-LABEL: @longjmp_only
 entry:
   ; CHECK: call void @emscripten_longjmp
   call void @longjmp(%struct.__jmp_buf_tag* getelementptr inbounds ([1 x %struct.__jmp_buf_tag], [1 x %struct.__jmp_buf_tag]* @buffer, i32 0, i32 0), i32 1) #1
   unreachable
 }
 
 ; Tests if SSA rewrite works when a use and its def are within the same BB.
 define void @ssa_rewite_in_same_bb() {
+; CHECK-LABEL: @ssa_rewite_in_same_bb
 entry:
   call void @foo()
   br label %for.cond
 
 for.cond:                                         ; preds = %for.inc, %entry
   ; CHECK: %{{.*}} = phi i32 [ %var[[VARNO:.*]], %for.inc.split ]
   %0 = phi i32 [ %var, %for.inc ], [ undef, %entry ]
   %var = add i32 0, 0