RFR: 8366028: MethodType::fromMethodDescriptorString should not throw UnsupportedOperationException for invalid descriptors [v2]

[Chen Liang]

> A previous cleanup #14642 accidentally omitted the fact that an `Array.newInstance` call in `BytecodeDescriptor::parseSig` is intended to propagate `IllegalArgumentException` to `MethodType::fromMethodDescriptorString`. This bug is discovered in a recent cleanup for `BytecodeDescriptor` in #24978.
> 
> Instead of restoring the original `newInstance` call, this patch catches the `UnsupportedOperationException` thrown by `Class::arrayType` to because the cause IAE thrown by `newInstance` has no message at all. The existing reporting system in `BytecodeDescriptor::parseMethod` includes the whole malformed descriptor string in the error message, which can be triggered by returning `null` in `parseSig`.

Chen Liang has updated the pull request incrementally with one additional commit since the last revision:

  A case for malformed return type

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Changes:
  - all: https://git.openjdk.org/jdk/pull/26909/files
  - new: https://git.openjdk.org/jdk/pull/26909/files/2a81b9d2..758ed7c5

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=26909&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=26909&range=00-01

  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/26909.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26909/head:pull/26909

PR: https://git.openjdk.org/jdk/pull/26909