Changing the default MaxNumPromotions from 2 to 3.

Summary: In performance tuning, we see performance benefits when enlarge the maximum num promotion targets to 3. This is safe as soon as we have total percentage threshold properly setup (https://reviews.llvm.org/D35962)

Reviewers: davidxl, tejohnson

Reviewed By: tejohnson

Subscribers: llvm-commits, sanjoy

Differential Revision: https://reviews.llvm.org/D35966

llvm-svn: 309346

llvm/lib/Analysis/IndirectCallPromotionAnalysis.cpp

@@ -58,7 +58,7 @@ static cl::opt<unsigned>
 // Set the maximum number of targets to promote for a single indirect-call
 // callsite.
 static cl::opt<unsigned>
-    MaxNumPromotions("icp-max-prom", cl::init(2), cl::Hidden, cl::ZeroOrMore,
+    MaxNumPromotions("icp-max-prom", cl::init(3), cl::Hidden, cl::ZeroOrMore,
                      cl::desc("Max number of promotions for a single indirect "
                               "call callsite"));