KVM: VMX: Print VM-instruction error when it may be helpful

Include the value of the "VM-instruction error" field from the current
VMCS (if any) in the error message for VMCLEAR and VMPTRLD, since each
of these instructions may result in more than one VM-instruction
error. Previously, this field was only reported for VMWRITE errors.

Signed-off-by: David Matlack <dmatlack@google.com>
[Rebased and refactored code; dropped the error number for INVVPID and
INVEPT; reworded commit message.]
Signed-off-by: Jim Mattson <jmattson@google.com>
Message-Id: <20220510224035.1792952-1-jmattson@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>