Increase gsharedvt trampolines by 10% from 4000 to 4400.

Eventually this stuff should be fully dynamic, but where it
really counts -- iOS -- it already is. Otherwise is testing only,
i.e. FullAOT on platforms that allow JIT.

There are many minor arguments here.

Arguably we should JIT these.
Either w/o a fixed pool, or when the pool is depleted.
But that defeats the test coverage.

The test coverage is partial in any case, but the current
approach probably best approximates iOS.

Mitigates mono#13888.
If this feels too tenative, go bigger.

configure.ac

@@ -1258,7 +1258,8 @@ with_bitcode_default=no
 enable_cooperative_suspend_default=no
 enable_hybrid_suspend_default=no
 
-INVARIANT_AOT_OPTIONS=nimt-trampolines=2000,ntrampolines=10000,nrgctx-fetch-trampolines=256,ngsharedvt-trampolines=4000,nftnptr-arg-trampolines=4000
+# For the sake of clearer error messages, these numbers should all be different from each other.
+INVARIANT_AOT_OPTIONS=nimt-trampolines=2000,ntrampolines=10000,nrgctx-fetch-trampolines=256,ngsharedvt-trampolines=4400,nftnptr-arg-trampolines=4000
 
 AOT_BUILD_ATTRS=$INVARIANT_AOT_OPTIONS