RFR: 8252518: cache result of CompilerToVM.getComponentType

[Doug Simon]

Linux perf profiles of CompileTheWorld with libgraal show that `CompilerToVM.getComponentType` is the most expensive
JVMCI VM entry point with almost 2% of total execution time:

+ 1.87% 0.04% [.] c2v_getComponentType
+ 0.54% 0.00% [.] c2v_installCode
     0.39% 0.00% [.] c2v_getResolvedJavaType0
     0.04% 0.00% [.] c2v_resolvePossiblyCachedConstantInPool
     0.03% 0.00% [.] c2v_interpreterFrameSize
     0.03% 0.01% [.] c2v_isAssignableFrom
     0.02% 0.00% [.] c2v_translate
     0.01% 0.00% [.] c2v_getIdentityHashCode

It's worth caching the result of this call.

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Commit messages:
 - 8252518: cache result of CompilerToVM.getComponentType

Changes: https://git.openjdk.java.net/jdk/pull/172/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=172&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8252518
  Stats: 13 lines in 1 file changed: 8 ins; 0 del; 5 mod
  Patch: https://git.openjdk.java.net/jdk/pull/172.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/172/head:pull/172

PR: https://git.openjdk.java.net/jdk/pull/172