Fix some tests where the only problem was incorrect retval

Fix some tests where the only problem was incorrect retval

The following tests return values other than 100 on success.  Modify the
harness to expect the values that they return:
```
JIT\jit64\regress\vsw\102754\test1\test1.cmd
JIT\Regression\CLR-x86-JIT\V1-M09\b16102\b16102\b16102.cmd
```
The following test is identical to `test1` in the same directory.  Delete
it.
```
JIT\jit64\regress\vsw\102754\test2\test2.cmd
```
`rem_r4` returns a non-Unix-compatible 0xAAAA (>255).  Change it to the
standard 100.
```
JIT\IL_Conformance\Old\Conformance_Base\rem_r4\rem_r4.cmd
```
The following were using the non-functional Environment.ExitCode.
Switched to Environment.Exit(Environment.ExitCode):
```
JIT\Methodical\switch\switch1\switch1.cmd
JIT\Methodical\switch\switch10\switch10.cmd
JIT\Methodical\switch\switch11\switch11.cmd
JIT\Methodical\switch\switch2\switch2.cmd
JIT\Methodical\switch\switch3\switch3.cmd
JIT\Methodical\switch\switch4\switch4.cmd
JIT\Methodical\switch\switch5\switch5.cmd
JIT\Methodical\switch\switch6\switch6.cmd
JIT\Methodical\switch\switch7\switch7.cmd
JIT\Methodical\switch\switch8\switch8.cmd
JIT\Methodical\switch\switch9\switch9.cmd
JIT\Methodical\tailcall\_il_dbgrecurse_ep_void\_il_dbgrecurse_ep_void.cmd
JIT\Methodical\tailcall\_il_dbgtest_void\_il_dbgtest_void.cmd
JIT\Methodical\tailcall\_il_relrecurse_ep_void\_il_relrecurse_ep_void.cmd
JIT\Methodical\tailcall\_il_reltest_void\_il_reltest_void.cmd
JIT\Regression\CLR-x86-JIT\V1-M12-Beta2\b65423\b65423\b65423.cmd
JIT\Regression\CLR-x86-JIT\V1.2-M01\b08046\b08046\b08046.cmd
```
Note that `b08046.cmd` is left disabled because it is still failing.