Fix missing #includes.

--- llvm-project-15.0.7.src/llvm/include/llvm/ADT/SmallVector.h	2023-01-12 07:12:30.000000000 +0000
+++ llvm-project-15.0.7.src/llvm/include/llvm/ADT/SmallVector.h	2025-07-06 22:40:23.752189061 +0100
@@ -19,6 +19,7 @@
 #include <algorithm>
 #include <cassert>
 #include <cstddef>
+#include <cstdint>
 #include <cstdlib>
 #include <cstring>
 #include <functional>
--- llvm-project-15.0.7.src/llvm/lib/Target/AMDGPU/MCTargetDesc/AMDGPUMCTargetDesc.h	2023-01-12 07:12:30.000000000 +0000
+++ llvm-project-15.0.7.src/llvm/lib/Target/AMDGPU/MCTargetDesc/AMDGPUMCTargetDesc.h	2025-07-06 23:32:52.520679048 +0100
@@ -15,6 +15,7 @@
 #ifndef LLVM_LIB_TARGET_AMDGPU_MCTARGETDESC_AMDGPUMCTARGETDESC_H
 #define LLVM_LIB_TARGET_AMDGPU_MCTARGETDESC_AMDGPUMCTARGETDESC_H
 
+#include <cstdint>
 #include <memory>
 
 namespace llvm {
--- llvm-project-15.0.7.src/llvm/lib/Target/X86/MCTargetDesc/X86MCTargetDesc.h	2023-01-12 07:12:30.000000000 +0000
+++ llvm-project-15.0.7.src/llvm/lib/Target/X86/MCTargetDesc/X86MCTargetDesc.h	2025-07-07 16:44:48.358099899 +0100
@@ -13,6 +13,7 @@
 #ifndef LLVM_LIB_TARGET_X86_MCTARGETDESC_X86MCTARGETDESC_H
 #define LLVM_LIB_TARGET_X86_MCTARGETDESC_X86MCTARGETDESC_H
 
+#include <cstdint>
 #include <memory>
 #include <string>