Sort allocas, compute frame pointer in Cfg pass

src/IceTargetLoweringX86Base.h

Index: src/IceTargetLoweringX86Base.h
diff --git a/src/IceTargetLoweringX86Base.h b/src/IceTargetLoweringX86Base.h
index 7380d561efd372fbd5bcc7af235ae8c4cf8e8137..1b52aad34a81a43838f6d60b3c37a5449ffc72f5 100644
--- a/src/IceTargetLoweringX86Base.h
+++ b/src/IceTargetLoweringX86Base.h
@@ -83,6 +83,7 @@ public:
   }
 
   bool hasFramePointer() const override { return IsEbpBasedFrame; }
+  void setHasFramePointer() override { IsEbpBasedFrame = true; }
   SizeT getStackReg() const override { return Traits::RegisterSet::Reg_esp; }
   SizeT getFrameOrStackReg() const override {
     return IsEbpBasedFrame ? Traits::RegisterSet::Reg_ebp
@@ -93,6 +94,9 @@ public:
     const uint32_t WordSizeInBytes = typeWidthInBytes(Traits::WordType);
     return Utils::applyAlignment(typeWidthInBytes(Ty), WordSizeInBytes);
   }
+  uint32_t getStackAlignment() const override {
+    return Traits::X86_STACK_ALIGNMENT_BYTES;
+  }
 
   bool shouldSplitToVariable64On32(Type Ty) const override {
     return Traits::Is64Bit ? false : Ty == IceType_i64;