Change encoding of instruction operands in bitcode binaries to be relative

to the instruction position.  The old encoding would give an absolute
ID which counts up within a function, and only resets at the next function.

I.e., Instead of having:

... = icmp eq i32 n-1, n-2
br i1 ..., label %bb1, label %bb2

it will now be roughly:

... = icmp eq i32 1, 2
br i1 1, label %bb1, label %bb2

This makes it so that ids remain relatively small and can be encoded
in fewer bits.

With this encoding, forward reference operands will be given
negative-valued IDs.  Use signed VBRs for the most common case
of forward references, which is phi instructions.

To retain backward compatibility we bump the bitcode version
from 0 to 1 to distinguish between the different encodings.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165739 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Bitcode/BitstreamReader.h

@@ -409,7 +409,7 @@ public:
   }
 
   /// EnterSubBlock - Having read the ENTER_SUBBLOCK abbrevid, enter
-  /// the block, and return true if the block is valid.
+  /// the block, and return true if the block has an error.
   bool EnterSubBlock(unsigned BlockID, unsigned *NumWordsP = 0) {
     // Save the current block's state on BlockScope.
     BlockScope.push_back(Block(CurCodeSize));