RFR: 8329191: JVMCI compiler warning is truncated [v2]

[Doug Simon]

> $ java -Djdk.graal.CompilerConfiguration=XXcommunity HelloWorld
> [0.035s][warning][jit,compilation] JVMCI compiler disabled after 11 of 11 upcalls had errors (Last error: "uncaught exception in call_HotSpotJVMCIRuntime_compileMethod [jdk.graal.compiler.debug.GraalError: Compiler configuration 'XXcommunity' not found. Available configurations are: enterp
> 
> The above message is truncated. It should be:
> 
> [0.032s][warning][jit,compilation] JVMCI compiler disabled after 11 of 11 upcalls had errors (Last error: "uncaught exception in call_HotSpotJVMCIRuntime_compileMethod [jdk.graal.compiler.debug.GraalError: Compiler configuration 'XXcommunity' not found. Available configurations are: enterprise, community, economy]"). Use -Xlog:jit+compilation for more detail.
> 
> 
> This PR fixes this by using `stringStream` instead of `err_msg` when creating these messages.

Doug Simon has updated the pull request incrementally with one additional commit since the last revision:

  converted more usages of err_msg to stringStream

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/18513/files
  - new: https://git.openjdk.org/jdk/pull/18513/files/5f23d0e7..61d6486d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18513&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18513&range=00-01

  Stats: 8 lines in 1 file changed: 4 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/18513.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18513/head:pull/18513

PR: https://git.openjdk.org/jdk/pull/18513