[CodeGen] Rename MachineInstr::isInvariantLoad to isDereferenceableInvariantLoad. NFC

Summary:
I want to separate out the notions of invariance and dereferenceability
at the MI level, so that they correspond to the equivalent concepts at
the IR level.  (Currently an MI load is MI-invariant iff it's
IR-invariant and IR-dereferenceable.)

First step is renaming this function.

Reviewers: chandlerc

Subscribers: MatzeB, jfb, llvm-commits

Differential Revision: https://reviews.llvm.org/D23370

llvm-svn: 281125

1 files changed, 1 insertions, 1 deletions

diff --git a/llvm/lib/CodeGen/MachineCSE.cpp b/llvm/lib/CodeGen/MachineCSE.cpp
index 1209f73d960..ecf93d8ba26 100644
--- a/llvm/lib/CodeGen/MachineCSE.cpp
+++ b/llvm/lib/CodeGen/MachineCSE.cpp
@@ -346,7 +346,7 @@ bool MachineCSE::isCSECandidate(MachineInstr *MI) {
     // Okay, this instruction does a load. As a refinement, we allow the target
     // to decide whether the loaded value is actually a constant. If so, we can
     // actually use it as a load.
-    if (!MI->isInvariantLoad(AA))
+    if (!MI->isDereferenceableInvariantLoad(AA))
       // FIXME: we should be able to hoist loads with no other side effects if
       // there are no other instructions which can change memory in this loop.
       // This is a trivial form of alias analysis.