Fix linking of unit tests with LLVM_LINK_LLVM_DYLIB
--- a/test-unit/CMakeLists.txt
+++ b/test-unit/CMakeLists.txt
@@ -46,6 +46,12 @@ else()
   endif()
 endif()
 
+# LLVM's gtest depends on LLVM Support, but installed llvm_gtest from
+# a LLVM_LINK_LLVM_DYLIB build does not carry that dependency.
+if(LLVM_LINK_LLVM_DYLIB AND NOT GTest_FOUND)
+  list(APPEND COMGR_GTEST_LIBS LLVM)
+endif()
+
 # Pin C++17 and mirror LLVM's RTTI setting (avoids type_info link errors
 # against LLVM libs built with RTTI off, including hotswap::raiser
 # which carries its own non-RTTI / non-exceptions compile flags via
@@ -113,7 +119,11 @@ add_executable(LoggerTests
   ../src/comgr-logger.cpp
   ../src/comgr-env.cpp)
 
-llvm_map_components_to_libnames(COMGR_TEST_UNIT_LOGGER_LIBS Support)
+if(LLVM_LINK_LLVM_DYLIB)
+  set(COMGR_TEST_UNIT_LOGGER_LIBS LLVM)
+else()
+  llvm_map_components_to_libnames(COMGR_TEST_UNIT_LOGGER_LIBS Support)
+endif()
 
 target_link_libraries(LoggerTests PRIVATE
   ${COMGR_GTEST_LIBS}
--- a/test-unit/hotswap/rewriter/CMakeLists.txt
+++ b/test-unit/hotswap/rewriter/CMakeLists.txt
@@ -18,8 +18,12 @@ add_executable(HotswapElfTests
   # definition so non-inlined builds (e.g. -O0 / ASan) resolve.
   ${PROJECT_SOURCE_DIR}/src/comgr-env.cpp)
 
-llvm_map_components_to_libnames(COMGR_TEST_UNIT_ELF_LIBS
-  BinaryFormat Object Support TargetParser)
+if(LLVM_LINK_LLVM_DYLIB)
+  set(COMGR_TEST_UNIT_ELF_LIBS LLVM)
+else()
+  llvm_map_components_to_libnames(COMGR_TEST_UNIT_ELF_LIBS
+    BinaryFormat Object Support TargetParser)
+endif()
 
 target_link_libraries(HotswapElfTests PRIVATE
   ${COMGR_GTEST_LIBS}
@@ -64,19 +68,23 @@ add_executable(HotswapMCTests
   ${PROJECT_SOURCE_DIR}/src/hotswap/rewriter/profile.cpp
   ${PROJECT_SOURCE_DIR}/src/time-stat/time-stat.cpp)
 
-llvm_map_components_to_libnames(COMGR_TEST_UNIT_MC_LIBS
-  BinaryFormat
-  MC
-  MCDisassembler
-  MCParser
-  Object
-  Support
-  TargetParser
-  AMDGPUAsmParser
-  AMDGPUCodeGen
-  AMDGPUDesc
-  AMDGPUDisassembler
-  AMDGPUInfo)
+if(LLVM_LINK_LLVM_DYLIB)
+  set(COMGR_TEST_UNIT_MC_LIBS LLVM)
+else()
+  llvm_map_components_to_libnames(COMGR_TEST_UNIT_MC_LIBS
+    BinaryFormat
+    MC
+    MCDisassembler
+    MCParser
+    Object
+    Support
+    TargetParser
+    AMDGPUAsmParser
+    AMDGPUCodeGen
+    AMDGPUDesc
+    AMDGPUDisassembler
+    AMDGPUInfo)
+endif()
 
 target_link_libraries(HotswapMCTests PRIVATE
   ${COMGR_GTEST_LIBS}
@@ -109,8 +117,12 @@ add_executable(HotswapProfileTests
   ${PROJECT_SOURCE_DIR}/src/hotswap/rewriter/profile.cpp
   ${PROJECT_SOURCE_DIR}/src/time-stat/time-stat.cpp)
 
-llvm_map_components_to_libnames(COMGR_TEST_UNIT_PROFILE_LIBS
-  BinaryFormat Object Support TargetParser)
+if(LLVM_LINK_LLVM_DYLIB)
+  set(COMGR_TEST_UNIT_PROFILE_LIBS LLVM)
+else()
+  llvm_map_components_to_libnames(COMGR_TEST_UNIT_PROFILE_LIBS
+    BinaryFormat Object Support TargetParser)
+endif()
 
 target_link_libraries(HotswapProfileTests PRIVATE
   ${COMGR_GTEST_LIBS}