Rename kDexCacheViaMethod to kRuntimeCall for HLoadClass/String.

The old name does not reflect the actual code anymore.

Test: testrunner.py --host
Change-Id: I2e13cf727bba9d901c4d3fc821bb526d38a775b8
diff --git a/compiler/optimizing/code_generator.h b/compiler/optimizing/code_generator.h
index c2b2ebf..ec02fe3 100644
--- a/compiler/optimizing/code_generator.h
+++ b/compiler/optimizing/code_generator.h
@@ -541,7 +541,7 @@
       case HLoadString::LoadKind::kBssEntry:
         DCHECK(load->NeedsEnvironment());
         return LocationSummary::kCallOnSlowPath;
-      case HLoadString::LoadKind::kDexCacheViaMethod:
+      case HLoadString::LoadKind::kRuntimeCall:
         DCHECK(load->NeedsEnvironment());
         return LocationSummary::kCallOnMainOnly;
       case HLoadString::LoadKind::kJitTableAddress: