[lldb][LocateModuleCallback] Fix LocateModuleCallbackTest

[splhack]

Summary

D153734 forgot to call Platform::SetHostPlatform before
Debugger::CreateInstance. Copy similar code.
https://github.com/llvm/llvm-project/blob/5007c78ce0936824972ec6ba3cfa598192087ee1/lldb/unittests/Expression/DWARFExpressionTest.cpp#L371-L374

[jasonmolenda]

unit tests pass clean with this patch, thanks! Maybe your mac build wasn't cmake'd with -DLLVM_ENABLE_ASSERTIONS=1 ?

[splhack]

@jasonmolenda thanks for verifying this! and yes, I didn't realize -DLLVM_ENABLE_ASSERTIONS=1 is missing.

lldb/unittests/Target/LocateModuleCallbackTest.cpp

 #include "lldb/Core/PluginManager.h"
 #include "lldb/Host/HostInfo.h"
 #include "lldb/Target/Target.h"
 #include "gmock/gmock.h"
 
 using namespace lldb;
 using namespace lldb_private;
 using namespace lldb_private::platform_android;
+using namespace lldb_private::platform_linux;
 using namespace lldb_private::breakpad;
 using namespace testing;
 
 namespace {
 
 constexpr llvm::StringLiteral k_process_plugin("mock-process-plugin");
 constexpr llvm::StringLiteral k_platform_dir("remote-android");
 constexpr llvm::StringLiteral k_cache_dir(".cache");

 ProcessSP MockProcessCreateInstance(TargetSP target_sp, ListenerSP listener_sp,
                                     const FileSpec *crash_file_path,
                                     bool can_connect) {
   return std::make_shared<MockProcess>(target_sp, listener_sp);
 }
 
 class LocateModuleCallbackTest : public testing::Test {
   SubsystemRAII<FileSystem, HostInfo, ObjectFileBreakpad, ObjectFileELF,
-                PlatformAndroid, SymbolFileBreakpad, SymbolFileSymtab>
+                PlatformAndroid, PlatformLinux, SymbolFileBreakpad,
+                SymbolFileSymtab>
       subsystems;
 
 public:
   void SetUp() override {
     m_test_dir = GetTestDir();
 
     // Set module cache directory for PlatformAndroid.
     PlatformAndroid::GetGlobalPlatformProperties().SetModuleCacheDirectory(
         m_test_dir);
 
     // Create Debugger.
+    ArchSpec host_arch("i386-pc-linux");
+    Platform::SetHostPlatform(
+        platform_linux::PlatformLinux::CreateInstance(true, &host_arch));
     m_debugger_sp = Debugger::CreateInstance();
     EXPECT_TRUE(m_debugger_sp);
 
     // Create PlatformAndroid.
     ArchSpec arch(k_arch);
     m_platform_sp = PlatformAndroid::CreateInstance(true, &arch);
     EXPECT_TRUE(m_platform_sp);