Fix jit test projects to specify debug type and optimization flags

Fix jit test projects to specify debug type and optimization flags

This partially addresses the issues raised in dotnet/coreclr#4124 and dotnet/coreclr#4724 by explicitly
and unconditionally setting DebugType and Optimize flags for various test
project files.

The projects that were fixed are those that did not specify any debug
flag settings at all.  The fix is to set DebugType to PdbOnly and to set
Optimization to true, unless the test has an _r or _rel suffix, in which
case Optimization is set false.

This impacts 1497 projects, skipping over 311 projects flagged as needing
fixes. The projects that remain are the CodeGenBringUp set (for which we plan
to clone projects to test the various flag combinations), projects that
specify flags but do so in ways where the effective flag settings may vary
from DBG to RET, projects that specify the flags redundantly, or projects
where the flags are not consistent with the "test case name suffix" rules.

The edits were done by a tool using linq-to-xml and so some incidental
reformatting has happened.

Commit migrated from https://github.com/dotnet/coreclr/commit/f60e421e3cc6c6c7160bc3b679e8a08530ae275a