Bitcode reader: Inline readAbbreviatedField in readRecord and move the enclosing loop in each case (NFC)

Summary: This make readRecord 20% faster, measured on an LTO build

Reviewers: rafael

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D17911

From: Mehdi Amini <mehdi.amini@apple.com>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@262811 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed