[MC] Compute fragment offsets eagerly

This builds on top of commit 9d0754ada5dbbc0c009bcc2f7824488419cc5530
("[MC] Relax fragments eagerly") and relaxes fragments eagerly to
eliminate MCSection::HasLayout and `getFragmentOffset` overhead.

Note: The removed `#ifndef NDEBUG` code (disabled by default) in
X86AsmBackend::finishLayout was problematic, as (a) !NDEBUG and NDEBUG
builds evaluated fragment offsets at different times before this patch
(b) one iteration might not be sufficient to converge. There might be
some edge cases that it did not handle. Anyhow, this patch probably
makes it work for more cases.

1 files changed, 2 insertions, 2 deletions

diff --git a/llvm/lib/MC/MCSection.cpp b/llvm/lib/MC/MCSection.cpp
index 8c2ee56..97e87a4 100644
--- a/llvm/lib/MC/MCSection.cpp
+++ b/llvm/lib/MC/MCSection.cpp
@@ -23,8 +23,8 @@ using namespace llvm;
 MCSection::MCSection(SectionVariant V, StringRef Name, bool IsText,
                      bool IsVirtual, MCSymbol *Begin)
     : Begin(Begin), BundleGroupBeforeFirstInst(false), HasInstructions(false),
-      HasLayout(false), IsRegistered(false), IsText(IsText),
-      IsVirtual(IsVirtual), Name(Name), Variant(V) {
+      IsRegistered(false), IsText(IsText), IsVirtual(IsVirtual), Name(Name),
+      Variant(V) {
   DummyFragment.setParent(this);
   // The initial subsection number is 0. Create a fragment list.
   CurFragList = &Subsections.emplace_back(0u, FragList{}).second;