try to fix build yet more after 16544cbe64

llvm/lib/Target/AMDGPU/AMDGPULibCalls.cpp

@@ -21,6 +21,7 @@
 #include "llvm/IR/IntrinsicsAMDGPU.h"
 #include "llvm/InitializePasses.h"
 #include "llvm/Target/TargetMachine.h"
+#include <cmath>
 
 #define DEBUG_TYPE "amdgpu-simplifylib"
 

llvm/lib/Target/NVPTX/NVPTXISelLowering.cpp

@@ -54,6 +54,7 @@
 #include "llvm/Target/TargetOptions.h"
 #include <algorithm>
 #include <cassert>
+#include <cmath>
 #include <cstdint>
 #include <iterator>
 #include <sstream>

llvm/lib/Target/PowerPC/PPCLoopInstrFormPrep.cpp

@@ -108,6 +108,7 @@
 #include "llvm/Transforms/Utils/LoopUtils.h"
 #include "llvm/Transforms/Utils/ScalarEvolutionExpander.h"
 #include <cassert>
+#include <cmath>
 #include <iterator>
 #include <utility>