Reduce how often we call FindDexCache

Before host boot.oat -j4 optimizing compile:
real  1m17.792s
user  3m26.140s
sys 0m8.340s

After:
real  1m12.324s
user  3m22.718s
sys 0m8.320s

Change-Id: If18e9e79e06cdf1676692e5efacb682bf93889c3

1 files changed, 9 insertions, 3 deletions

diff --git a/compiler/optimizing/builder.h b/compiler/optimizing/builder.h
index d6b25ee822..560ed86e50 100644
--- a/compiler/optimizing/builder.h
+++ b/compiler/optimizing/builder.h
@@ -40,7 +40,8 @@ class HGraphBuilder : public ValueObject {
                 const DexFile* dex_file,
                 CompilerDriver* driver,
                 OptimizingCompilerStats* compiler_stats,
-                const uint8_t* interpreter_metadata)
+                const uint8_t* interpreter_metadata,
+                Handle<mirror::DexCache> dex_cache)
       : arena_(graph->GetArena()),
         branch_targets_(graph->GetArena(), 0),
         locals_(graph->GetArena(), 0),
@@ -57,7 +58,8 @@ class HGraphBuilder : public ValueObject {
         latest_result_(nullptr),
         can_use_baseline_for_string_init_(true),
         compilation_stats_(compiler_stats),
-        interpreter_metadata_(interpreter_metadata) {}
+        interpreter_metadata_(interpreter_metadata),
+        dex_cache_(dex_cache) {}
 
   // Only for unit testing.
   HGraphBuilder(HGraph* graph, Primitive::Type return_type = Primitive::kPrimInt)
@@ -77,7 +79,8 @@ class HGraphBuilder : public ValueObject {
         latest_result_(nullptr),
         can_use_baseline_for_string_init_(true),
         compilation_stats_(nullptr),
-        interpreter_metadata_(nullptr) {}
+        interpreter_metadata_(nullptr),
+        dex_cache_(NullHandle<mirror::DexCache>()) {}
 
   bool BuildGraph(const DexFile::CodeItem& code);
 
@@ -334,6 +337,9 @@ class HGraphBuilder : public ValueObject {
 
   const uint8_t* interpreter_metadata_;
 
+  // Dex cache for dex_file_.
+  Handle<mirror::DexCache> dex_cache_;
+
   DISALLOW_COPY_AND_ASSIGN(HGraphBuilder);
 };