[llvm-ml] Remove unsafe getCurrentSegmentOnly() call (llvm#123355)

This call was made unsafe recently, but was not fixed in
db48f1a (the commit that fixed the
parallel code in AsmParser.cpp).

Fixes llvm#123189

Author: ericastor

llvm/lib/MC/MCParser/COFFMasmParser.cpp

@@ -441,6 +441,9 @@ bool COFFMasmParser::parseDirectiveOption(StringRef Directive, SMLoc Loc) {
 ///          statements
 ///      label "endproc"
 bool COFFMasmParser::parseDirectiveProc(StringRef Directive, SMLoc Loc) {
+  if (!getStreamer().getCurrentFragment())
+    return Error(getTok().getLoc(), "expected section directive");
+
   StringRef Label;
   if (getParser().parseIdentifier(Label))
     return Error(Loc, "expected identifier for procedure");

llvm/lib/MC/MCParser/MasmParser.cpp

@@ -1454,7 +1454,8 @@ bool MasmParser::Run(bool NoInitialTextSection, bool NoFinalize) {
 }
 
 bool MasmParser::checkForValidSection() {
-  if (!ParsingMSInlineAsm && !getStreamer().getCurrentSectionOnly()) {
+  if (!ParsingMSInlineAsm && !(getStreamer().getCurrentFragment() &&
+                               getStreamer().getCurrentSectionOnly())) {
     Out.initSections(false, getTargetParser().getSTI());
     return Error(getTok().getLoc(),
                  "expected section directive before assembly directive");

llvm/test/tools/llvm-ml/bare_proc_error.asm

@@ -0,0 +1,7 @@
+; RUN: not llvm-ml -filetype=s %s /Fo /dev/null 2>&1 | FileCheck %s
+
+; CHECK: :[[# @LINE+1]]:1: error: expected section directive
+foo PROC
+; CHECK: :[[# @LINE+1]]:6: error: expected section directive before assembly directive
+  ret
+foo ENDP

llvm/test/tools/llvm-ml/no_section_error.asm

@@ -0,0 +1,4 @@
+; RUN: not llvm-ml -filetype=s %s /Fo /dev/null 2>&1 | FileCheck %s
+
+; CHECK: :[[# @LINE + 1]]:6: error: expected section directive before assembly directive in 'BYTE' directive
+BYTE 2, 3, 4