Add HASH_DEREF_FETCH and ARRAY_DEREF_FETCH superoperators

[fglock]

Summary

This PR adds two superoperators to the bytecode interpreter that combine multiple instruction sequences into single operations:

HASH_DEREF_FETCH (opcode 381)

• Pattern replaced: DEREF_HASH + LOAD_STRING + HASH_GET
• Format: HASH_DEREF_FETCH rd hashref_reg key_string_idx
• Optimizes: $hashref->{key} with bareword or string literal keys
• Impact: Eliminates ~2,498 instruction sequences in ExifTool tests (~7.3% of hash operations)

ARRAY_DEREF_FETCH (opcode 382)

• Pattern replaced: DEREF_ARRAY + LOAD_INT + ARRAY_GET
• Format: ARRAY_DEREF_FETCH rd arrayref_reg index_immediate
• Optimizes: $arrayref->[n] with integer literal indices

Files Changed

• Opcodes.java: Added opcode constants 381-384 (strict and non-strict variants)
• CompileBinaryOperator.java: Pattern detection for -> operator
• BytecodeCompiler.java: Helper methods and pattern detection
• BytecodeInterpreter.java: Execution handlers for all superoperators
• Disassemble.java: Disassembly support

Example

Before (3 instructions):

DEREF_HASH r9 = %{r8}
LOAD_STRING r10 = "key"
HASH_GET r3 = r9{r10}

After (1 instruction):

HASH_DEREF_FETCH r3 = r8->{"key"}

Bug Fix: RuntimeList Handling

Fixed a regression where (caller)[0] and similar expressions failed with:

Can't use string ("...") as an ARRAY ref while "strict refs" in use

Root cause: Superoperators were incorrectly used in handleGeneralArrayAccess()
where the input could be a RuntimeList (not a scalar reference).

Fix: Superoperators are now only used in the -> operator handler where the
left side is always compiled in SCALAR context.

Test plan

• Build succeeds: ./gradlew build
• All existing tests pass: ./gradlew test
• Hash access works: $hashref->{key} returns correct value
• Array access works: $arrayref->[n] returns correct value
• Nested access works: $data->{users}->[0]->{name}
• (caller)[0] works correctly
• Getopt::Long module works
• examples/life_bitpacked.pl works
• Disassembly shows superoperators being emitted

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