RFR: 8264096: slowdebug jvm crashes when StrInflatedCopy match rule is not supported

[Fei Yang]

As shown on the bug, two JVM crashes are witnessed when running the provided test case after disabling match rule support for StrInflatedCopy.  

The cause for the first JVM crash is that we are calling has_match_rule for Op_StrInflatedCopy in is_intrinsic_supported.  
In this case, we have match rule for Op_StrInflatedCopy but that match rule is not supported.  
Patch fixed the first crash by changing the use of has_match_rule into match_rule_supported.  match_rule_supported  will check has_match_rule at entry point.  

In the case for the second JVM crash, the C2 code path is different when match rule for StrInflatedCopy is not supported.  
In PhaseStringOpts::copy_latin1_string, we will call GraphKit::inflate_string_slow instread of GraphKit::inflate_string.  
We emit one loop in GraphKit::inflate_string_slow, but the method is not marked may have some loops.  
Looks like this is missed by JDK-8253923.  Patch fixed the second crash by setting _has_loops to true in GraphKit::inflate_string_slow.  

Testing: tier 1-3 tested with release & fastdebug build on x86_64 linux with match rule support for StrInflatedCopy explicitly disabled.

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Commit messages:
 - 8264096: slowdebug jvm crashes when StrInflatedCopy match rule is not supported

Changes: https://git.openjdk.java.net/jdk/pull/3166/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3166&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8264096
  Stats: 4 lines in 2 files changed: 2 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3166.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3166/head:pull/3166

PR: https://git.openjdk.java.net/jdk/pull/3166