Revert "Verify sizes when trying to read a VBR"

This reverts r234984 since it seems to break some bots (most of them
seemed arm*-selfhost).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@234998 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Bitcode/BitstreamReader.h

@@ -395,7 +395,6 @@ public:
   // Read a VBR that may have a value up to 64-bits in size. The chunk size of
   // the VBR must still be <= 32 bits though.
   uint64_t ReadVBR64(unsigned NumBits) {
-    assert(NumBits <= 64 && "VBR can only be up to 64 bits in size.");
     uint32_t Piece = Read(NumBits);
     if ((Piece & (1U << (NumBits-1))) == 0)
       return uint64_t(Piece);

lib/Bitcode/Reader/BitstreamReader.cpp

@@ -62,8 +62,6 @@ static uint64_t readAbbreviatedField(BitstreamCursor &Cursor,
   case BitCodeAbbrevOp::Fixed:
     return Cursor.Read((unsigned)Op.getEncodingData());
   case BitCodeAbbrevOp::VBR:
-    if ((unsigned)Op.getEncodingData() > 64)
-      report_fatal_error("Invalid record");
     return Cursor.ReadVBR64((unsigned)Op.getEncodingData());
   case BitCodeAbbrevOp::Char6:
     return BitCodeAbbrevOp::DecodeChar6(Cursor.Read(6));

test/Bitcode/invalid.test

@@ -55,8 +55,3 @@ RUN: not llvm-dis -disable-output %p/Inputs/invalid-no-proper-module.bc 2>&1 | \
 RUN:   FileCheck --check-prefix=NO-MODULE %s
 
 NO-MODULE: Malformed IR file
-
-RUN: not llvm-dis -disable-output %p/Inputs/invalid-VBR-too-big.bc 2>&1 | \
-RUN:   FileCheck --check-prefix=HUGE-VBR %s
-
-HUGE-VBR: Invalid record