Add r228939 back with a fix.

The problem in the original patch was not switching back to .text after printing
an eh table.

Original message:

On ELF, put PIC jump tables in a non executable section.

Fixes PR22558.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@229586 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Target/TargetLoweringObjectFile.h

@@ -98,6 +98,9 @@ public:
   getSectionForJumpTable(const Function &F, Mangler &Mang,
                          const TargetMachine &TM) const;
 
+  virtual bool shouldPutJumpTableInFunctionSection(bool UsesLabelDifference,
+                                                   const Function &F) const;
+
   /// Targets should implement this method to assign a section to globals with
   /// an explicit section specfied. The implementation of this method can
   /// assume that GV->hasSection() is true.