Subzero: Control memory growth from local label fixups.

src/IceTargetLoweringX8664.cpp

 //===- subzero/src/IceTargetLoweringX8664.cpp - x86-64 lowering -----------===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 605 matching lines @@
     // By default, ConstantRelocatables are emitted (in textual output) as
     //
     //  ConstantName + Offset
     //
     // ReturnReloc has an offset that is only known during binary emission.
     // Therefore, we set a custom emit string for ReturnReloc that will be
     // used instead. In this particular case, the code will be emitted as
     //
     //  push .after_call
     InstX86Label *ReturnAddress = InstX86Label::create(Func, this);
-    auto *ReturnRelocOffset = RelocOffset::create(Ctx);
+    auto *ReturnRelocOffset = RelocOffset::create(Func->getAssembler());
     ReturnAddress->setRelocOffset(ReturnRelocOffset);
     constexpr RelocOffsetT NoFixedOffset = 0;
     const IceString EmitString = ReturnAddress->getName(Func);
-    auto *ReturnReloc = llvm::cast<ConstantRelocatable>(
-        Ctx->getConstantSym(NoFixedOffset, {ReturnRelocOffset},
-                            Func->getFunctionName(), EmitString));
+    auto *ReturnReloc = ConstantRelocatable::create(
+        Func->getAssembler(), IceType_i32,
+        RelocatableTuple(NoFixedOffset, {ReturnRelocOffset},
+                         Func->getFunctionName(), EmitString));
     /* AutoBundle scoping */ {
       std::unique_ptr<AutoBundle> Bundler;
       if (CallTargetR == nullptr) {
         Bundler = makeUnique<AutoBundle>(this, InstBundleLock::Opt_PadToEnd);
         _push(ReturnReloc);
       } else {
         Variable *T = makeReg(IceType_i32);
         Variable *T64 = makeReg(IceType_i64);
         Variable *r15 =
             getPhysicalRegister(Traits::RegisterSet::Reg_r15, IceType_i64);
@@ skipping 162 matching lines @@
 #define X(tag, sizeLog2, align, elts, elty, str, rcstr)                        \
   static_assert(_table1_##tag == _table2_##tag,                                \
                 "Inconsistency between ICETYPEX8664_TABLE and ICETYPE_TABLE");
 ICETYPE_TABLE
 #undef X
 } // end of namespace dummy3
 } // end of anonymous namespace
 
 } // end of namespace X8664
 } // end of namespace Ice