Use isPositionIndependent in a few more places.

I think this converts all the simple cases that really just care about
the generated code being position independent or not. The remaining
uses are a bit more complicated and are checking things like "is this
a library or executable" or "can this symbol be preempted".

llvm-svn: 274055
diff --git a/llvm/lib/Target/Hexagon/HexagonFrameLowering.cpp b/llvm/lib/Target/Hexagon/HexagonFrameLowering.cpp
index 92ba475..ee4c7f5 100644
--- a/llvm/lib/Target/Hexagon/HexagonFrameLowering.cpp
+++ b/llvm/lib/Target/Hexagon/HexagonFrameLowering.cpp
@@ -1058,7 +1058,7 @@
     const char *SpillFun = getSpillFunctionFor(MaxReg, SK_ToMem,
                                                StkOvrFlowEnabled);
     auto &HTM = static_cast<const HexagonTargetMachine&>(MF.getTarget());
-    bool IsPIC = HTM.getRelocationModel() == Reloc::PIC_;
+    bool IsPIC = HTM.isPositionIndependent();
 
     // Call spill function.
     DebugLoc DL = MI != MBB.end() ? MI->getDebugLoc() : DebugLoc();
@@ -1112,7 +1112,7 @@
     SpillKind Kind = HasTC ? SK_FromMemTailcall : SK_FromMem;
     const char *RestoreFn = getSpillFunctionFor(MaxR, Kind);
     auto &HTM = static_cast<const HexagonTargetMachine&>(MF.getTarget());
-    bool IsPIC = HTM.getRelocationModel() == Reloc::PIC_;
+    bool IsPIC = HTM.isPositionIndependent();
 
     // Call spill function.
     DebugLoc DL = MI != MBB.end() ? MI->getDebugLoc()