Have kernel binary scanner load dSYMs as binary+dSYM if best thing found (#1896)

lldb's PlatforDarwinKernel scans the local filesystem (well known
locations, plus user-specified directories) for kernels and kexts
when doing kernel debugging, and loads them automatically.  Sometimes
kernel developers want to debug with *only* a dSYM, in which case they
give lldb the DWARF binary + the dSYM as a binary and symbol file.
This patch adds code to lldb to do this automatically if that's the
best thing lldb can find.

A few other bits of cleanup in PlatformDarwinKernel that I undertook
at the same time:

1. Remove the 'platform.plugin.darwin-kernel.search-locally-for-kexts'
setting.  When I added the local filesystem index at start of kernel
debugging, I thought people might object to the cost of the search
and want a way to disable it.  No one has.

2. Change the behavior of
'plugin.dynamic-loader.darwin-kernel.load-kexts' setting so it does
not disable the local filesystem scan, or use of the local filesystem
binaries.

3. PlatformDarwinKernel::GetSharedModule into GetSharedModuleKext and
GetSharedModuleKernel for easier readability & maintenance.

4. Added accounting of .dSYM.yaa files (an archive format akin to tar)
that I come across during the scan.  I'm not using these for now; it
would be very expensive to expand the archives & see if the UUID matches
what I'm searching for.

<rdar://problem/69774993>
Differential Revision: https://reviews.llvm.org/D88632

(cherry picked from commit a1e9792)

Author: jasonmolenda

lldb/source/Plugins/DynamicLoader/Darwin-Kernel/DynamicLoaderDarwinKernel.cpp

@@ -517,12 +517,8 @@ DynamicLoaderDarwinKernel::DynamicLoaderDarwinKernel(Process *process,
   Status error;
   PlatformSP platform_sp(
       Platform::Create(PlatformDarwinKernel::GetPluginNameStatic(), error));
-  // Only select the darwin-kernel Platform if we've been asked to load kexts.
-  // It can take some time to scan over all of the kext info.plists and that
-  // shouldn't be done if kext loading is explicitly disabled.
-  if (platform_sp.get() && GetGlobalProperties()->GetLoadKexts()) {
+  if (platform_sp.get())
     process->GetTarget().SetPlatform(platform_sp);
-  }
 }
 
 // Destructor