Test basic SEH directive-parsing functionality. Fix a latent bug exposed by

this test.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132004 91177308-0d34-0410-b5e6-96231b3b80d8

lib/MC/MCStreamer.cpp

@@ -21,7 +21,8 @@
 using namespace llvm;
 
 MCStreamer::MCStreamer(MCContext &Ctx) : Context(Ctx), EmitEHFrame(true),
-                                         EmitDebugFrame(false) {
+                                         EmitDebugFrame(false),
+                                         CurrentW64UnwindInfo(0) {
   const MCSection *section = NULL;
   SectionStack.push_back(std::make_pair(section, section));
 }

test/MC/AsmParser/directive_seh.s

@@ -0,0 +1,18 @@
+# RUN: llvm-mc -triple x86_64-pc-win32 %s | FileCheck %s
+
+# CHECK: .seh_proc func
+# CHECK: .seh_stackalloc 8
+# CHECK: .seh_endprologue
+# CHECK: .seh_endproc
+
+    .text
+    .globl func
+    .def func; .scl 2; .type 32; .endef
+    .seh_proc func
+func:
+    subq $8, %rsp
+    .seh_stackalloc 8
+    .seh_endprologue
+    addq $8, %rsp
+    ret
+    .seh_endproc