RFR: 8259375: JvmtiExport::jni_Get/SetField_probe calls do not need ResetNoHandleMark

[Coleen Phillimore]

This is a trivial change to remove the comments and the ResetNoHandleMark from jvmti functions.  They're called by JNI_ENTRY so they don't have a NoHandleMark that needs to be reset.  It may not have always been the case.
Tested with the other patch for https://bugs.openjdk.java.net/browse/JDK-8258032 and retesting with tier1-3.

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Commit messages:
 - 8259375: JvmtiExport::jni_Get/SetField_probe calls do not need ResetNoHandleMark

Changes: https://git.openjdk.java.net/jdk/pull/1975/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1975&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8259375
  Stats: 18 lines in 2 files changed: 0 ins; 14 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1975.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1975/head:pull/1975

PR: https://git.openjdk.java.net/jdk/pull/1975