[llvm] Replacing asserts with static_asserts where appropriate

Summary:
This patch consists of the suggestions of clang-tidy/misc-static-assert check.


Reviewers: alexfh

Reviewed By: alexfh

Subscribers: xazax.hun, llvm-commits

Differential Revision: http://reviews.llvm.org/D8343

llvm-svn: 232366
diff --git a/llvm/lib/CodeGen/SlotIndexes.cpp b/llvm/lib/CodeGen/SlotIndexes.cpp
index d46621d..025ae70 100644
--- a/llvm/lib/CodeGen/SlotIndexes.cpp
+++ b/llvm/lib/CodeGen/SlotIndexes.cpp
@@ -127,7 +127,7 @@
 void SlotIndexes::renumberIndexes(IndexList::iterator curItr) {
   // Number indexes with half the default spacing so we can catch up quickly.
   const unsigned Space = SlotIndex::InstrDist/2;
-  assert((Space & 3) == 0 && "InstrDist must be a multiple of 2*NUM");
+  static_assert((Space & 3) == 0, "InstrDist must be a multiple of 2*NUM");
 
   IndexList::iterator startItr = std::prev(curItr);
   unsigned index = startItr->getIndex();