[llvm-exegesis] deserializeMCInst(): bump SmallVector small size up to 16

Summary:
... from 8.
`VALIGNDZ128rmbik XMM0 XMM0 K1 XMM3 RDI i_0x1  i_0x0  i_0x1` instruction already has 9 components.
It does not matter much in terms of performance, but avoiding allocation seems to come with low cost here..

Reviewers: courbet, gchatelet

Reviewed By: courbet

Subscribers: tschuett, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D57654

llvm-svn: 353022
diff --git a/llvm/tools/llvm-exegesis/lib/BenchmarkResult.cpp b/llvm/tools/llvm-exegesis/lib/BenchmarkResult.cpp
index e18fdf3..fae7512 100644
--- a/llvm/tools/llvm-exegesis/lib/BenchmarkResult.cpp
+++ b/llvm/tools/llvm-exegesis/lib/BenchmarkResult.cpp
@@ -40,7 +40,7 @@
   }
 
   void deserializeMCInst(llvm::StringRef String, llvm::MCInst &Value) {
-    llvm::SmallVector<llvm::StringRef, 8> Pieces;
+    llvm::SmallVector<llvm::StringRef, 16> Pieces;
     String.split(Pieces, " ", /* MaxSplit */ -1, /* KeepEmpty */ false);
     if (Pieces.empty()) {
       ErrorStream << "Unknown Instruction: '" << String << "'";