RFR: 8334442: Temporarily disable return type assertion to reduce noise in testing

[Roberto Castañeda Lozano]

This changeset disables the following assertion and its associated information dump temporarily, to reduce noise in the testing pipelines while the root cause of its failures is investigated in [JDK-8305185](https://bugs.openjdk.org/browse/JDK-8305185):


# Internal Error (src/hotspot/share/opto/parse1.cpp:1051)
# assert(false) failed: Can't determine return type.

Note that the unexpected condition catched by the assertion is harmless (other than potentially causing a performance degradation) because it always results in a compilation bailout.

**Testing:** tier1 (x64 and aaarch64; linux, windows, and macosx; release and debug mode)

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Commit messages:
 - Disable assert

Changes: https://git.openjdk.org/jdk/pull/19762/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19762&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8334442
  Stats: 10 lines in 1 file changed: 0 ins; 10 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/19762.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19762/head:pull/19762

PR: https://git.openjdk.org/jdk/pull/19762